The PLC (POTS Line Coupler) provides all of the isolation required to couple two standard POTS lines together. This provides a dial tone from the alternate line through a call on the primary line. An alternate PSTN carrier can be used for the second call or any type of alternate network base station (VoIP, GSM converter, GW) as long as it presents a POTS interface to the caller. The unit is primarily designed for voice calls although modems may be used over an alternate PSTN at a reduced data rate, about half.

Controller RequiredThe PLC can operate with a single line controller for dedicated applications using an SP-RRC (Single Port Remote Reboot Controller) or a three port FTS (Flexie TelCo Switch). As the name implies, the FTS presents a number of shared line or multi-network configuration possibilities. It can support up to three PLCs or a combination of PLCs, voice sets, faxes, answering machines or modems. It may even turn the power ON or OFF if a CPS AC power "base unit" is connected.

The controllers initially answer the call on the primary line and control the PLC. They also provide password protection as well as other programmable features.

The system is easy to use. Simply place a call to the number where the PLC/controller is connected and enter your touch-tone password, if used. You will then be presented with a second dial tone allowing you to dial over the alternate network.

If you are using the multi-port FTS, you would also enter a port number where other PLCs or compatible terminating devices are connected.

ExampleA typical touch-tone command to access the alternate network may look like:#0 PASS 2#8 #0 is the attention command for the controller that you are usingPASS is the controllers password (consult the controller manual)2 is the port number on multi-port controllers#8 is the off-hook command to the alternate networkIf connected to a terminating device such as a phone, fax, or modem, this instruction would be #4 (no action)Do not use spaces they are used for clarification only

In the event that a number is miss-entered, you would hang up and try again. Hang-up supervision on the alternate line is handled by the controller and the PLC.

These touch-tone commands can be entered manually or appended to the AT dial string.